My Brother's Keeper (Charles Sheffield novel)

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My Brother's Keeper is a 1982 science fiction novel by Charles Sheffield. The story takes place in approximately 2000 from the perspective of the early 80s. The hero of the story is a professional concert pianist, who has a twin brother who does mysterious work for the US State Department. The brothers are in a helicopter crash and in order for one of them to survive, doctors use experimental neurosurgery to combine parts of their remaining brains. When the patient awakens, the pianist brother is in control of the body, but has access to his brother's memories and realizes he must complete the spy's last mission for him.